Expansion cramp device.



PATENTED JAN. 30, 1906A F. DEMORSIER.

EXPANSION CRAMP DEVICE.

APPLICATION TILEDIIIAR.8.19O5.

STATESENi @fiiiFihCihh XPANSlON CWAWN DEVlt-I,

no. eii,iea.

Specication of Letters Patent,

Patented Jan; 30, EQG.

ppiication filed Merch 8, 1905. Serial No. 249,107.

To all whom t may concern:

Be it known that i, FRDRIC De Moneum, a citizen of the Republic oi Switzerland, residing at Geneva, Switzerland, have invented certain new and useful Improvements in Expension Cramp Devices, oi' which the following is a clear, full, and exact description.

'ihe object oi my invention is to provide a simple, cheap, and practical expansion crarnp device for securinp; a. purchase Within a plane surfacel against longitudinal pull-such, for instance, as is adapted to secure a hook in a we l.

In carrying' ont my invention I provide a nuinher of legs of inetal substantially pareln iei to each other, free at their outer ends, and joined at their butt-ends, each such set being. of i! shape. These plural legs may with advantage be stamped out oi one sheet of metal. it the butt-end oilv the legs Where they join each other i insert through a suitable open-' ing a threaded screw to act as an expansive member, either alone or with an independent expansion-ping. The screw is adapted to he rotated without rotating; the sets off legs, but to advance longitudinally between them as a result oi this rotation. in my preferred oonstrnction 'i bend the legs at right angles where they join, and within the square thus formed i locate a collar or nut, so fitting' between the legs as not to turn. Thus I secure a simple Y advancing means for the threaded screw. The

lege along their outer sides may be provided with projections to take into the sides of the hole into which they are to bc inserted. The projections may be one or more'on each leg'. When more than onel prefer to graduate their lengths, the projection nearest the free end oi' the leg,r being of greater length than the `one near the butt-end.

in the accompanying drawings, Figurel is a central longitudinal sectional view of anni]- attached device of my invention. Fig. 2 is a section on the line A B of Fig. l1. is a view similar to Fig. 1 with the device in secured position. Fig. i ie a plan on the line E F oi2 Fig. 3, and Fig. 5 is a view similar to Fig'. 3 of a modified forni ot device.

Fig. 3y

The device of Figs. i. to fi, inclusive, is shown as composed oi four legs e, each provided at its free end with a projection and at a die tance from its free end with. a. projection d. Each pair'of legs liorrnsa letter t beingL joined at right angles at their butt-ends to a perforated holdinrr-plate which may weil he integrai with the iegs. The inner haii' lengths of the legs are preierahiy lformed nearer to gether than their butt-ends. fwithin the poiygonai space termed these .legs Where they join the piate g1 innate a, collar or net c, shaped to contorni te the shape ci said space, and i pase e screvrwspindie i tiiieugh the perforated plate, so as to screw into the nntn Ali parts of the device shown in iiigu ii of lesa diameter than the hole which is to re ceive them, so the device can he readiiy inbcen. done, the screw is revoivedq causingits end, Whichihave shown as a wedge, to 'press the inner ende ot the legs apa-rt to canse their projnatione to he forced into the Wall ort' the openiiiiin. an olivione mannern The device ci Fig. 5 oniy andere trein that just described in that an independent wedge fw is need to cooperate with thescretr e' and the iegsngz' are formed oi @raduni taper in steed of jyith the more arcuate taper in their mid-portions, as shown in the gnrea herein before described. Y

i. claim as .my inventionWV An expansion device ooinprieinn' et ieaet a pair oi legs oi sheet rnetai errtending,r in the same generai direction joined at their huttends and bent toward each other so as to he closer together at theiriree ends than at thei r butt, a nut in the butt-end, as to he embraced hy the to prevent its rotation and a screw passing' throng'h the natn Signed at `Geneva., Switzerland, this '23d day of Eebruary, 1905 mannaro nn Viitnesses:

J. Morrrnn,

HORACE Lne Waernne'ron.

MRSER,

so fitting therein 

